Spectacle Lens Marking Layout for Measurement Accuracy
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Solution Overview
Problem
Operators face challenges in accurately measuring power and checking the fitting point of concave surface progressive power spectacle lenses due to parallax and shifts in the virtual image of permanent marks on the convex surface, making it difficult to locate the correct reference positions for power measurement and fitting checks.
Innovation Solution
A spectacle lens design where permanent marks are placed on the concave surface and a layout mark indicating a predetermined reference position is placed on the convex surface, allowing operators to directly locate the reference position on the convex surface, thereby improving the accuracy of power measurement and fitting point checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If permanent marks are placed on the convex surface for alignment reference, then the marks are easily visible and accessible, but the layout mark position shifts due to parallax and refraction making accurate power measurement difficult
Solution Approach 1:
The patent divides the marking system into two separate components: permanent marks (etched on concave surface) for alignment reference and layout marks (painted on convex surface) for power measurement positioning. This segmentation allows each mark type to serve its specific function without interference, resolving the contradiction between visibility and measurement accuracy.
Solution Approach 2:
The layout mark acts as an intermediary element between the permanent alignment marks and the power measurement process. By providing a dedicated reference position mark on the convex surface that is not subject to parallax shifts, it mediates the measurement process and enables accurate power measurement without being affected by the optical distortions that plague direct viewing of concave surface marks.
2Measurement precision
If permanent marks are etched on the concave surface to avoid parallax issues, then measurement accuracy improves, but operators cannot directly locate reference positions on the convex surface
Solution Approach 1:
The layout mark serves as an intermediary that bridges the gap between the permanent marks on the concave surface and the need for direct reference on the convex surface. It provides a visible, easily locatable position mark on the convex surface that corresponds to the permanent alignment reference, enabling both accurate measurement and ease of operation.
Solution Approach 2:
The layout mark on the convex surface essentially copies or replicates the positional information of the permanent marks on the concave surface. This copying allows operators to locate reference positions directly on the convex surface without needing to view through the lens and interpret virtual images of the permanent marks.
3Ease of operation
If layout mark is painted on the same convex surface as permanent marks, then both marks are easily accessible, but the layout mark position shifts due to parallax when viewing permanent marks
Solution Approach 1:
The patent segments the marking functions by placing permanent marks and layout marks on different surfaces (concave and convex respectively). This segmentation prevents the parallax-induced position shifts that would occur if both marks were on the same surface, while maintaining ease of operation by keeping both mark types accessible on their respective surfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the accuracy of power measurement and fitting point checks by eliminating parallax errors and allowing direct reference to the convex surface layout mark, improving operational precision in optician shops.
Implementation Method 1
the position of the virtual image of the permanent mark appearing on the convex surface is shifted off from a proper position where the virtual image is supposed to appear, depending on parallax due to refraction
Implementation Method 2
the position of the virtual image of the permanent mark appearing on the convex surface is shifted off from a proper position where the virtual image is supposed to appear, depending on parallax due to refraction
Data Source
AI summary
In a spectacle lens including a permanent mark arranged on a concave surface, a layout mark indicating a predetermined reference position on a convex surface is arranged on the convex surface.